①,Performance level: 10.9S;
Recommended materials: 20MnTiB (GB/T3077), ML20MnTiB (GB/T6478), applicable specifications: ≤ M24;
35CrMo (GB/T3077), 35VB (chemical composition%: C 0.31~0.37, Mn 0.50~0.90, Si 0.17~0.37, P ≤ 0.04, S ≤ 0.04, V 0.05-0.12, B 0.001~0.004, Cu ≤ 0.25), applicable specifications: M27, M30.
After agreement between the supply and demand parties, other materials can also be used, but they should be specified in the order contract and marked with T (followed by S or H) on the bolt products.
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